Drill-head-hammering device



Nov.. 4 1924. 1,514,498

- Y. YAMANOUCHI ET AL DRILL HEAD HAMMERING DEVICE Filed Jan. i7 1924 s shuts-sheet 1 Eig N v T15 c ,il I `I V n ,5" f fifi r' "Il" ."v 54' t D* 4,1 4 r", 7

Nov. 4 11924,` 1,514,498

Y. YAMANOUCHI ET AL DRILL HEAD HAMMERING DEVICE Filed Jan. 17 1924 3 Sheets-Sheet 2 Nov. 4 1924. 1,514,498

, Y. YAMANOUCHI ET AL -DRILL HEAD HAMMERING DEVICE 'Filed Jan. 17 1924 s sheets-sheet Patented Nov. 4, i924.

YUJI YAMANOUCHI, OF KYOTO, ANB KAZUZOSHI HIRBRA, GFF OSAKA, JAPAN.

Darts-nnen-rrnrrianarns DEVICE.

appnanon med January 17', i924. serial No. 696,869.

To all whomy it mf/,g/ concern.'

Be it known that we, YUJI, YAMA'NOUCHI, a subject of the Emperor of Japan, residing at No. 164 4-Cho1'ne, Kiyomizu, Shimolryo- Ku, city of Kyoto, Empire of Japan, and KAzUxosHr Hmimami, a subject of the Emperor of Japan, residing at No. 71-C, S-Chome, l-londencho-Dori, Nishi-Ku, city of Osaka, Empire of Japan, have jointly invented certain new and useful improvements in Drill-Head-Hammering Devices, of which the following is a specification.

rfhe present invention relates to drill head hammering devices and the features of this invention are particularly well adapted for rock drills. This invention is characterized by the feature that the hammering member is held freely movable between a pair of guide plates, each plate having an arcshaped slot by which the hammering member is guided.

The object of this invention is to provide simple and effective construction which will transmit a strong shock to a hammer head with smooth rotation, and by which the undesirable shock to the driving shaft due to the swinging down of the hammering member can be greatly reduced.

In the accompanying drawings Fig. 1 is a side view of a rock drill embodying this invention, a portion of which is broken away to show the inner parts;

Fig. 2 is a plan view of same, a portion of which being broken away;

Fig. 3 is a vertical sectional view of an essential part, and

Fig. 4 illustrates the moving conditions of the hammering member.

The same reference numerals represent the same or similar parts.

Referring to the drawings, a rotating or driving shaft 2 is mounted on a suitable frame work 1 and is adapted to be rotated by an electric motor or other prime movers through a flexible shaft 3. The shaft 2 has fixed on it an eccentric disc, or circular enlarged portion 4 which is eccentrically located so as to have a similar construction as an eccentric, two guide plates 5 being fixed to said portion. These plates are composed of project-ing portions 5 extended from one side of a boss 5 and annular flanges 5 extended from the opposite inner Side. of said boss. The circumferential extent of anges 5is shown by broken lines in Fig. 4. When said portions 5 and flanges 5 are fixed on to the shaft in an opposite relation, some space should naturally be left between two guide plates 5 by the 'present construction. An arc-shaped slot 6 is provided on each of saidvprojecting porti-ons. 5 and disposed radially. 7 indicates a somewhat cylindrical hammering member, therlugs 8 of which are 'guided by saidslots. By this arrangement the hammering member vcan he held between the guide plates in a free iioating relation.

By thus rotating' the shaft 2, the hammering member is shifted to the outer extremity of the slot by its centrifugal force, as shown in Fig. 4A, and when Ait 'strikes against the end of hammer head 9 which is supported on the frame, the hammering member will swing down along the slot and retract to the inner extremity of the slot, owing to the combined action of the reaction of the striking and the direction of rotation of the guide plates, as shown in Fig. 4B, and pass over the hammer head after giving a striking to it, and then again proceed to the outer extremity of the slot due to centrifugal force and ready for another striking, as shown in As the hammering member thus moves in its arc-shaped passage, the rotating shaft is very slightly affected by the shock and movement of the hammering member. Moreover, by the arrangement according to this invention the shock on the shaft when the hammering member swings down and strikes against the shaft can be greatly reduced; the slotted surface of an enlarged portion of rotating shaft between guide plates constituting the shock damper, said member will strike against the surface mildly, and the shock given to the hammer head is transmitted to a drill 10 which is fitted in contact with said head.

If it is required in some instances to rotate the drill after each lmock, as for instance in the case of a rock drill, the driving shaft 2 may have eccentric discs xed on it or circular disc 11 fixed to the enlarged portion of the shaft and eccentric rod 12 connected to an eccentric strap surrounding said disc to swing a forked rod 13 according to the rotation of the main shaft, a pawl which is mounted on the forked portion of the rod 13 is engaged with a toothed Wheel 14 which is fixed to the drill 10. Thus the drill 10 can be revolved after each shock.

Llhe arrangement according to this invention as above described has an advantage of giving heavy striking on the hammer head with less shock and edect to the shaft due to the shifting of the hammering member Which on the contrary Will cooperate and assist the rotation of the shaft. Accordingly, the smooth operation is obtained and the irregularity of motion which is subjected in almost all of such kinds of apparatuses can be greatly reduced and moreover it is simple in construction.

Having now described our invention, We claim l. In a drill head hammering device, the combination With a substantially cylindrical hammer member having end lugs, of a pair of guide plates having are-shaped slots radially disposed and arranged to guide said lugs of the hammer member, and a driving shaft for said guide plates.

2. In a drill head hammering device, the combination With a substantially cylindrical hammer member having end lugs, of a pair of guide plates provided With projecting eX- tensions having aro-shaped slots radially dislugs, of a pair of eccentric guide plates hav- I? ing radially disposed arc-shaped slots arranged to guide said lugs of the hammer member, a driving shaft for said eccentric guide plates and means to rotate said drill successively, said means consisting of an eccentric disc mounted on said driving shaft, a forked rod secured thereto, a paWl mounted on the end of said Jforked rod and a toothed Wheel fixed to said drill and arranged to be engaged by said pawl for every rotation of said driving shaft.

Signed at the city of Kobe this 27th day of Dec. 1923.

YUJI YAh/IANOUCHI. KAZUYOSHI HIRABARA, 

